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A court of human rights has ordered the British government to keep providing a terminally-ill baby with "appropriate" treatment after a London High Court ruled he should be allowed to die with dignity.

Ten-month-old Charlie Gard suffers from a rare genetic condition and is in the terminal stages of a disease called mitochondrial DNA depletion syndrome.

Charlie's parents have been fighting to take him to the US for experimental treatment, going against the wishes of doctors and independent experts.

In April, a High Court in the UK ruled that life support for Charlie, who is also brain damaged, should be switched off, rejecting an emergency appeal by his parents.

But today the European Court of Human Rights ruled British doctors should continue to provide Charlie "with such treatment and nursing care as may be appropriate to ensure that he suffers the least distress and retains the greatest dignity consistent, insofar as possible, with maintaining life."

"Great Ormond Street Hospital have already taken us to court to try and gain permission to turn off our baby's ventilation which will result in Charlie's death."

The human rights court said Charlie's parents had filed a request for an urgent interim measure to stay the London ruling to allow it to examine the request which it said had received "detailed consideration".

Charlie pictured at Great Ormond Street Hospital

A court statement added that "in the interests of the parties" it was asking the British government to prolong the application of the interim measure until June 19, extending its initial demand to continue treatment through to June 9.

Interim ECHR measures are urgent exceptional measures granted only in cases where there is an imminent risk of irreparable harm.

They are also binding on the British government rather than the hospital treating Charlie.

Charlie Gard is in the 'terminal stages' of a disease called mitochondrial DNA depletion syndrome

Specialists at Great Ormond Street Hospital, where the baby is being treated, had asked the High Court judge to rule on the legality of withdrawing life-support treatment.

The child's parents want to take him to the United States for experimental treatment for his form of mitochondrial disease, which causes progressive muscle weakness.

His family have raised more than $2 million online for the treatment, through more than 80,000 donations.